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El magmatismo KREEP prolongado en la Luna indicado por la roca ígnea lunar fechada más joven
Lars E Borg1, Charles K Shearer, Yemane Asmerom
1Institute of Meteoritics, Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, USA. lborg@unm.edu
Nature
|November 13, 2004
Resumen
Un nuevo análisis revela que el magmatismo de potasio, tierras raras y fósforo (KREEP) en la Luna persistió durante otros mil millones de años. Este hallazgo, basado en la muestra lunar fechada más joven, amplía nuestra comprensión de la historia geológica lunar.
Área de la Ciencia:
- Geología lunar geología lunar.
- Ciencias planetarias Ciencias planetarias.
- Petrología Petrología.
Sus antecedentes:
- La diversidad de composición de la Luna se originó a partir de la solidificación primordial y la fusión de su océano de magma.
- Las primeras rocas lunares eran ricas en olivino y piroxeno, seguidas de rocas ricas en plagioclase.
- Los materiales de potasio, tierras raras y fósforo (KREEP) se formaron durante las etapas finales de cristalización del océano de magma.
Objetivo del estudio:
- Para investigar la duración y la extensión del magmatismo KREEP en la Luna.
- Para determinar si KREEP estuvo involucrado en una actividad magmática lunar más reciente.
- Para analizar la muestra lunar fechada más joven en busca de evidencia de KREEP.
Principales métodos:
- Análisis de la muestra lunar fechada más joven.
- Análisis geoquímico y cronológico de muestras lunares.
- Las técnicas de datación radiométrica.
Principales resultados:
- La evidencia sugiere que el magmatismo KREEP se extendió por otros mil millones de años más allá de las líneas de tiempo previamente establecidas.
- La muestra lunar fechada más joven muestra características del magmatismo KREEP.
- Esto extiende el período conocido de actividad geológica relacionada con KREEP en la Luna.
Conclusiones:
- El magmatismo KREEP estuvo activo durante más tiempo de lo que se pensaba.
- Los hallazgos desafían los modelos existentes de evolución térmica lunar y magmatismo.
- Esta extensa actividad magmática tiene implicaciones para la comprensión de las fuentes internas de calor de la Luna y la evolución geológica.
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